Removed ember-sticky-element in favour of native position: sticky

no issue

- native `position: sticky` support is now good enough across the board of our supported browser versions to use in place of a JS version for our use cases
- `ember-sticky-element` is preventing the dependency update of `ember-in-viewport` so removing it will allow a lot of our sub-dependencies to be updated

ghost/admin/lib/koenig-editor/addon/components/koenig-card.hbs

@@ -1,7 +1,8 @@
 {{#if this.icon}}
-    <StickyElement @top={{this.iconTop}} @bottom={{36}}>
+    <div class="sticky" style="top: {{this.iconTop}}px; margin-bottom: {{this.iconTop}}px">
         {{svg-jar this.icon class=this.iconClass}}
-    </StickyElement>
+    </div>
+    <div style="margin-top: -{{this.iconTop}}px"></div>
 {{/if}}
 
 {{yield (hash

ghost/admin/package.json

@@ -97,7 +97,6 @@
     "ember-simple-auth": "3.0.0",
     "ember-sinon": "5.0.0",
     "ember-source": "3.21.3",
-    "ember-sticky-element": "0.2.3",
     "ember-svg-jar": "2.2.3",
     "ember-test-selectors": "5.0.0",
     "ember-truth-helpers": "2.1.0",

ghost/admin/yarn.lock

@@ -6194,7 +6194,7 @@ ember-in-element-polyfill@^1.0.0:
     ember-cli-htmlbars "^4.3.1"
     ember-cli-version-checker "^5.0.2"
 
-ember-in-viewport@3.5.8, ember-in-viewport@~3.0.0, ember-in-viewport@~3.7.2:
+ember-in-viewport@3.5.8, ember-in-viewport@~3.7.2:
   version "3.5.8"
   resolved "https://registry.yarnpkg.com/ember-in-viewport/-/ember-in-viewport-3.5.8.tgz#da03f5e69c5e5e6cbd048f0db8de0b05c2e3e68f"
   integrity sha512-2GBK5KbNYiGADy433tN3yHnxZ77wSnVyMezx23cr3qs2gwac+5ta2FkOTiKibNkGmWE/Mk/c7zcF7sDk1jy5DA==
@@ -6480,15 +6480,6 @@ ember-source@3.21.3:
     semver "^6.1.1"
     silent-error "^1.1.1"
 
-ember-sticky-element@0.2.3:
-  version "0.2.3"
-  resolved "https://registry.yarnpkg.com/ember-sticky-element/-/ember-sticky-element-0.2.3.tgz#39702e0fc0f04905a7b34add61a85a9186d3d16b"
-  integrity sha512-AtKkM8zh6LK5FsPxtsDywUSodGk5c2AI03vcgk995dC5Z7DG4XLJoAwV0FZM5RYnymnYEJvOs6VTcIM8uwcX5w==
-  dependencies:
-    ember-cli-babel "^6.8.2"
-    ember-cli-htmlbars "^2.0.1"
-    ember-in-viewport "~3.0.0"
-
 ember-svg-jar@2.2.3:
   version "2.2.3"
   resolved "https://registry.yarnpkg.com/ember-svg-jar/-/ember-svg-jar-2.2.3.tgz#632f8d6a999ceb1c815a135fbc2bd681b856330b"